Improvement in copying-presses



w. u. Munnik". CUPying-Prgssas.

m A j v Patnted jan, 20,",1874. u

STATES NITE 1li- VVILLVIAM U. FAIRBAIRN, OF BOSTON7 SELF, W. S.OHAMBERLIN, AND O. E. RANDALL.

IMPROVEMENT EN COPYING-PRESSES.

Specification forming part of Letters Patent No. 46,5 l 9, dated January720, 1874; application -iiled December 17, 1873.

`of the operator at the final compression-so much so that not only theparts of the appar ratus require considerable weight, but also that `thestand or table has to be of great strength,

inorder to resist electually the strain to which it is subjected.

To avoid this over-straining, to make a press which is light, and toreduce the expense in the manufacture of it, to cause the operation ofworking to be easy and without shocks and injury to the stand, and makeit thus more convenient, is the object of my invention; and `Iaccomplish this by applying hydrostatic pressure,` either by means of aforce-pump, when water or other liquids are to be used, or by the directpressure` of public water-works, where it is available.

Referring to the drawing, C represents the base of the press, consistingof a square or rectangular trame connected by tubes G G', with circularcenter-piece or basin, K, and ot the tubular standards F E. The frame Cis provided with a rim to guide the movable plate B, to the lowerportion of which is tted the convex disk D. An elastic diaphragm otrubber, L, is secured water-tight by ring M, and screws to the rim ot'the basin K. The plate A is rmly attached to the standards F E, as

' shown, one of Which, E, `forms the pump-barrel, into which a piston,O, is moved by means of screw H and hand-wheel P. At the end ot one ofthe passages Gr G is attached a four-way cock, N, to form connectionwith the conduit of water-works, or to discharge the water or fluid fromthe passages and basin.

Then liquids and force-pump are used, raise the piston and lill withliquid the passages, basin, and standards. Afterthe copying-book isplaced between the plates the piston is moved down by the screw Hworking in the nut in the upper portion of the piston, and theliquid isthus forced against the diaphragm L, which latter, Vwith disk D a-ndplate B, exerts the pressure required to the copying-book. By elevatingthe piston by return movement of screw, the pressure of platen D isreleased and the press ready for a repetition of the operation.

If water from a reservoir is used as acting Y force, then, by simplyoperating the tour-way` cock N, the desired work is eii'ected withoutrequiring the pump at all.

EVhat I claim as my invention, and desire to secure by Letters Patent,is r 1. A copying-press with force-pump, diaphragm L, and plate B,operated by hydrostatic pressure, as above specified.

2. A copying-presswith tubular standards F E, piston O, basin K,diaphragm L, plate B, in combination with discharge-cock N.

3. A copying-press with standards F E, diaphragm L, plate B, andfour-way cock N, coinbined in the manner and for the purpose as abovedescribed.

WM. U. FAIRBAIRN.

Witnesses:

W. S. CHAMBERLIN, GHAs. E. RANDALL.

